This article was adapted from a book that was indeed professionally edited and proofread and had the phrasing I showed here. Clearly, editing often involves some subjective judgment and isn't always black-and-white. The important point is to have someone with editing experience and a sharp eye, like you obviously have, look over the work.

We've all read a lot of stuff that doesn't appear to have examined by anyone other than the author before it went live. I recently pointed out to a landscaping contractor that the company name painted on his truck was missing an "e." He said, "Hmm, all of our trucks are like that."